The periods of rotation and activity cycles are among the most important properties of the magnetic dynamo thought to be operating in late-type , main-sequence stars . In this paper , we present a S _ { MWO } -index time series composed from different data sources for the solar-like star HD 140538 and derive a period of 3.88 \pm 0.02 yr for its activity cycle . Furthermore , we analyse the high-cadence , seasonal S _ { MWO } data taken with the TIGRE telescope and find a rotational period of 20.71 \pm 0.32 days . In addition , we estimate the stellar age of HD 140538 as 3.7 Gyrs via a matching evolutionary track . This is slightly older than the ages obtained from gyrochronology based on the above rotation period , as well as the activity-age relation . These results , together with its stellar parameters that are very similar to a younger Sun , make HD 140538 a relevant case study for our understanding of solar activity and its evolution with time .